It is still unclear whether AB InBev will opt to raise all the funds in US dollars or might include tranches in euros or other currencies.

One banker said that even if the company were to raise the entire amount in US dollars, a strong marketing effort in Europe would not be unusual for a deal of this size.

"For something like this, 25 per cent of the book could be European accounts," said the banker.

Market participants say that if market conditions remains supportive, a formal announcement could be expected as soon as Tuesday or Wednesday.

"Usually you don't see calls unless they are going to do a deal," one buyside trader said. "They can prime everybody now and move fast." US companies have rushed to the bond markets to finance acquisitions and share buybacks, selling a record US$1.269 trillion of new bonds in 2015, and there is an estimated US$200 billion pipeline of M&A bond financing in the works for 2016.

AB InBev, rated A2 by Moody's and A- by Standard & Poor's, has backed its US$100 billion-plus bid for SABMiller with a record US$75 billion syndicated loan, TRLPC reported in November.

The company's vice president for treasury, risk management and financial markets, Fernando Tennenbaum, and director of funding Matt Amer will host the calls.